Blur - Gaussian

The Blur - Gaussian effect softens the image, reducing the amount of noise and detail. The look of the Gaussian blur is smooth, but does take some rendering time. This effect is useful when rendering time is less important, and quality is more important. Also, you can use a matte with this effect to isolate areas of the image.

For detailed video tutorials and sample scenes by Adam Phillips, see

Blur - Gaussian Properties

Parameter Description
Truck Factor Activated by default, this option readjusts the blur when the elements undergo a change of depth or scale. When this option is deselected, the effect's values remain unchanged regardless of any depth or scale changes. This option should be deselected when multiple drawings are composited and attached to this effect.
Repeat Edge Pixels Makes the blur algorithm operate as if the pixel values beyond the edge of the layer are the same as the values of the edge pixels. This keeps edges sharp, preventing them from darkening and becoming more transparent.
Directional Blurs according to the length, width, and angle you specify. For example, if a character is walking east, the blur may fall to the west.
Blurriness Amount of blur applied to the layer.
Horizontal Blurriness Length of the blur.
Vertical Blurriness Thickness of the blur.
Angle The direction in which the blur is applied: sideways, up, down, 90 degrees, 45 degrees, and so on.
Bidirectional Blurs in both horizontal and vertical directions.

Precision: Blurs the image the number of times the precision indicates at different radius (between 0 and the specified radius).